06-18-2017, 10:14 PM
Join Date: Feb 2017
Location: Camano Island WA
Questions about my 2003 5.7 Stroker build , CR, PCM
Been reading this since I bought my 03' Ram 7 years ago, but never really had the need to post a question till now.
I am in the process of ordering a stroker kit for my 5.7 hemi , and the question of how much compression can I run with a stock 03 PCM and a Superchips 91 tune . I blew up a piston at 253K miles and am going to get a stroker motor to go in. The build is for a Daily Driver 03 RCSB , lowered 2/4 , hauls a few tools around, and a 20' SeaRay a couple times a year. This truck has to be dependable in the northwest, temps from 100 down to 20 degrees, rain , snow, I wanted a 370 stroker but all the builders are backed up for 2-3 months and I need one quick, like 30 days.
Quickest choice is a 392 stroker from a 5.7 block.
Manley Stroker rotating assembly
Pistons ??? what CR can I run ??
Comp Cams 260 (beats most cams out there until 4,800 rpm)
Pushrods 6.1 pushrods ???
PAC 1218 springs / Pac locators
5.7 heads , minor exhaust port matching to my long tube headers, Just a cleanup mill to the heads .005"
It has the original 545rfe in it, with the Transgo HD-2 kit in it, resistor added, PLUS I am also running the sonnex line booster, yellow wire delete at tcm, works well . I have no plans for a converter, I drive 150 miles a day and this is my work rig, needs to get decent gas mileage, and be dependable for another 50K miles , and be able to hold it's own against any Beemers or Rice Burners that want to cut me off !!!!
So whats a safe compression ratio ? 10:1 , 10.25:1 / 10.5:1 ???
PCM issues ?